Quoted identifiers in column names

Add the ability to quote identifiers for columns in a table. This would allow column names to contain arbitrary characters such as spaces. Hive supports these types of identifiers using backquotes. For example,

create table parquet_table (`Session Token` string) stored as parquetfile;

However, attempting to insert a new row into this table results in an error.

insert into parquet_table values ('1234-45')

org.apache.hadoop.hive.ql.metadata.HiveException: java.lang.IllegalArgumentException: field ended by ';': expected ';' but got 'token' at line 1: optional string Session Token

I would suggest using backquotes in Parquet as well.

**Reporter**: [Michael Styles](https://issues.apache.org/jira/secure/ViewProfile.jspa?name=ptkool)

_{**Note**: *This issue was originally created as [PARQUET-677](https://issues.apache.org/jira/browse/PARQUET-677). Please see the [migration documentation](https://issues.apache.org/jira/browse/PARQUET-2502) for further details.*}

Comienza reproduciendo el ejemplo de Hive con la columna `Session Token` y el insert que falla en `parquet_table`. Rastrea el procesamiento de Parquet Java implicado en el esquema y en la ruta del insert; se considera terminado cuando se aceptan los identificadores entre comillas que contienen espacios y el insert se realiza correctamente sin el error de nombre de campo indicado.

Escrito por el modelo de indexación a partir del texto del issue.